[v5,5/6] net: maclorawan: Implement maclorawan class module

Message ID	20181216101858.9585-6-starnight@g.ncu.edu.tw
State	Changes Requested, archived
Delegated to:	David Miller
Headers	show Return-Path: <netdev-owner@vger.kernel.org> From: Jian-Hong Pan <starnight@g.ncu.edu.tw> To: =?utf-8?q?Andreas_F=C3=A4rber?= <afaerber@suse.de>, "David S . Miller" <davem@davemloft.net>, Alan Cox <gnomes@lxorguk.ukuu.org.uk> Cc: linux-lpwan@lists.infradead.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Marcel Holtmann <marcel@holtmann.org>, Dollar Chen <dollar.chen@wtmec.com>, Ken Yu <ken.yu@rakwireless.com>, linux-wpan@vger.kernel.org, Jian-Hong Pan <starnight@g.ncu.edu.tw> Subject: [PATCH v5 5/6] net: maclorawan: Implement maclorawan class module Date: Sun, 16 Dec 2018 18:18:59 +0800 Message-Id: <20181216101858.9585-6-starnight@g.ncu.edu.tw> In-Reply-To: <CAC=mGziyi1ierhg++SUcHMrq1JQ0vH4gZCKUZgchzb8aD1Rv5Q@mail.gmail.com> References: <CAC=mGziyi1ierhg++SUcHMrq1JQ0vH4gZCKUZgchzb8aD1Rv5Q@mail.gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk
Series	net: lorawan: Add LoRaWAN soft MAC module \| expand [v5,0/6] net: lorawan: Add LoRaWAN soft MAC module [v5,1/6] net: lorawan: Add LoRaWAN socket module [v5,2/6] net: lorawan: Add LoRaWAN API declaration for LoRa devices [v5,3/6] net: maclorawan: Add maclorawan module declaration [v5,4/6] net: maclorawan: Implement the crypto of maclorawan module [v5,5/6] net: maclorawan: Implement maclorawan class module [v5,6/6] net: lorawan: List LORAWAN in menuconfig

diff --git a/net/maclorawan/Kconfig b/net/maclorawan/Kconfig new file mode 100644 index 000000000000..d700314edf26 --- /dev/null +++ b/net/maclorawan/Kconfig @@ -0,0 +1,14 @@ +config MACLORAWAN + tristate "Generic LoRaWAN Soft Networking Stack (maclorawan)" + depends on LORAWAN + select CRYPTO + select CRYPTO_CMAC + select CRYPTO_CBC + select CRYPTO_AES + help + This option enables the hardware independent LoRaWAN + networking stack for SoftMAC devices (the ones implementing + only PHY level of LoRa standard). + + If you plan to use HardMAC LoRaWAN devices, you can say N + here. Alternatively you can say M to compile it as a module. diff --git a/net/maclorawan/Makefile b/net/maclorawan/Makefile new file mode 100644 index 000000000000..562831e66c82 --- /dev/null +++ b/net/maclorawan/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_MACLORAWAN) += maclorawan.o +maclorawan-objs := main.o mac.o crypto.o diff --git a/net/maclorawan/mac.c b/net/maclorawan/mac.c new file mode 100644 index 000000000000..459ab95ff52d --- /dev/null +++ b/net/maclorawan/mac.c @@ -0,0 +1,555 @@ +// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause +/*- + * LoRaWAN soft MAC + * + * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw> + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/poll.h> +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/lora/lorawan.h> +#include <linux/lora/lorawan_netdev.h> + +#include "maclorawan.h" +#include "crypto.h" + +static void rx_timeout_work(struct work_struct *work); + +struct lrw_session * +lrw_alloc_ss(struct lrw_struct *lrw_st) +{ + struct lrw_session *ss; + + ss = kzalloc(sizeof(*ss), GFP_KERNEL); + if (!ss) + goto lrw_alloc_ss_end; + + ss->lrw_st = lrw_st; + ss->devaddr = lrw_st->devaddr; + INIT_LIST_HEAD(&ss->entry); + + ss->tx_should_ack = false; + ss->retry = 3; + spin_lock_init(&ss->state_lock); + INIT_WORK(&ss->timeout_work, rx_timeout_work); + +lrw_alloc_ss_end: + return ss; +} + +void +lrw_free_ss(struct lrw_session *ss) +{ + netdev_dbg(ss->lrw_st->ndev, "%s\n", __func__); + if (ss->tx_skb) + consume_skb(ss->tx_skb); + netdev_dbg(ss->lrw_st->ndev, "%s: free rx skb\n", __func__); + if (ss->rx_skb) + consume_skb(ss->rx_skb); + + netdev_dbg(ss->lrw_st->ndev, "%s: free ss\n", __func__); + kfree(ss); +} + +void +lrw_del_ss(struct lrw_session *ss) +{ + netdev_dbg(ss->lrw_st->ndev, "%s\n", __func__); + list_del(&ss->entry); + lrw_free_ss(ss); +} + +void +lrw_del_all_ss(struct lrw_struct *lrw_st) +{ + struct lrw_session *ss, *tmp; + + mutex_lock(&lrw_st->ss_list_lock); + lrw_st->_cur_ss = NULL; + list_for_each_entry_safe(ss, tmp, &lrw_st->ss_list, entry) { + del_timer(&ss->timer); + lrw_del_ss(ss); + } + mutex_unlock(&lrw_st->ss_list_lock); +} + +void +lrw_ready_hw(struct lrw_struct *lrw_st) +{ + lrw_st->state = LRW_STATE_IDLE; +} + +int +lrw_start_hw(struct lrw_struct *lrw_st) +{ + int ret = 0; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + lrw_st->nwks_shash_tfm = lrw_mic_key_setup(lrw_st->nwkskey, + LRW_KEY_LEN); + lrw_st->nwks_skc_tfm = lrw_encrypt_key_setup(lrw_st->nwkskey, + LRW_KEY_LEN); + lrw_st->apps_skc_tfm = lrw_encrypt_key_setup(lrw_st->appskey, + LRW_KEY_LEN); + lrw_st->state = LRW_START; + ret = lrw_st->ops->start(&lrw_st->hw); + if (!ret) + lrw_ready_hw(lrw_st); + + return ret; +} + +void +lrw_stop_hw(struct lrw_struct *lrw_st) +{ + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + lrw_st->state = LRW_STOP; + netdev_dbg(lrw_st->ndev, "%s: going to stop hardware\n", __func__); + lrw_st->ops->stop(&lrw_st->hw); + + netdev_dbg(lrw_st->ndev, "%s: going to kill tasks & flush works", + __func__); + tasklet_kill(&lrw_st->xmit_task); + flush_work(&lrw_st->rx_work); + + netdev_dbg(lrw_st->ndev, "%s: going to delete all session\n", __func__); + lrw_del_all_ss(lrw_st); + + netdev_dbg(lrw_st->ndev, "%s: going to free mic tfm\n", __func__); + lrw_mic_key_free(lrw_st->nwks_shash_tfm); + netdev_dbg(lrw_st->ndev, "%s: going to free nwks tfm\n", __func__); + lrw_encrypt_key_free(lrw_st->nwks_skc_tfm); + netdev_dbg(lrw_st->ndev, "%s: going to free apps tfm\n", __func__); + lrw_encrypt_key_free(lrw_st->apps_skc_tfm); +} + +void +lrw_prepare_tx_frame(struct lrw_session *ss) +{ + struct lrw_struct *lrw_st = ss->lrw_st; + struct sk_buff *skb = ss->tx_skb; + u8 mhdr, fctrl, fport; + u8 mic[LRW_MIC_LEN]; + __le32 le_devaddr; + __le16 le_fcnt_up; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + /* Encrypt the plain buffer content */ + lrw_encrypt_buf(lrw_st->apps_skc_tfm, LRW_UPLINK, + ss->devaddr, ss->fcnt_up, skb->data, skb->len); + + /* Push FPort */ + if (skb->len) { + fport = ss->fport; + memcpy(skb_push(skb, LRW_FPORT_LEN), &fport, LRW_FPORT_LEN); + } + + /* Push FCnt_Up */ + le_fcnt_up = cpu_to_le16(ss->fcnt_up); + memcpy(skb_push(skb, LRW_FCNT_LEN), &le_fcnt_up, LRW_FCNT_LEN); + + /* Push FCtrl */ + fctrl = 0; + if (lrw_st->rx_should_ack) { + fctrl |= 0x20; + lrw_st->rx_should_ack = false; + } + memcpy(skb_push(skb, LRW_FCTRL_LEN), &fctrl, LRW_FCTRL_LEN); + + /* Push DevAddr */ + le_devaddr = cpu_to_le32(ss->devaddr); + memcpy(skb_push(skb, LRW_DEVADDR_LEN), &le_devaddr, LRW_DEVADDR_LEN); + + /* Push MHDR */ + mhdr = LRW_UNCONFIRMED_DATA_UP << 5; + if ((mhdr & (0x6 << 5)) == (0x4 << 5)) + ss->tx_should_ack = true; + memcpy(skb_push(skb, LRW_MHDR_LEN), &mhdr, LRW_MHDR_LEN); + + /* Put MIC */ + lrw_calc_mic(lrw_st->nwks_shash_tfm, LRW_UPLINK, + ss->devaddr, ss->fcnt_up, skb->data, skb->len, mic); + memcpy(skb_put(skb, LRW_MIC_LEN), mic, LRW_MIC_LEN); +} + +void +lrw_xmit(unsigned long data) +{ + struct lrw_struct *lrw_st = (struct lrw_struct *)data; + struct lrw_session *ss = lrw_st->_cur_ss; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + ss->state = LRW_XMITTING_SS; + lrw_st->ops->xmit_async(&lrw_st->hw, ss->tx_skb); +} + +int +lrw_parse_frame(struct lrw_session *ss, struct sk_buff *skb) +{ + struct lrw_struct *lrw_st = ss->lrw_st; + struct lrw_fhdr *fhdr = &ss->rx_fhdr; + __le16 *p_fcnt; + + pr_debug("%s: %s\n", LORAWAN_MODULE_NAME, __func__); + + /* Get message type */ + fhdr->mtype = skb->data[0]; + skb_pull(skb, LRW_MHDR_LEN); + + /* Trim Device Address */ + skb_pull(skb, LRW_DEVADDR_LEN); + + /* Get frame control */ + fhdr->fctrl = skb->data[0]; + skb_pull(skb, LRW_FCTRL_LEN); + + /* Ack the original TX frame if it should be acked */ + if (ss->tx_should_ack && (fhdr->fctrl & 0x20)) + ss->tx_should_ack = false; + + /* Get frame count */ + p_fcnt = (__le16 *)skb->data; + fhdr->fcnt = le16_to_cpu(*p_fcnt); + skb_pull(skb, LRW_FCNT_LEN); + + /* Get frame options */ + fhdr->fopts_len = fhdr->fctrl & 0xF; + if (fhdr->fopts_len > 0) { + if (skb->len < fhdr->fopts_len) + goto lrw_parse_frame_err; + memcpy(fhdr->fopts, skb->data, fhdr->fopts_len); + skb_pull(skb, fhdr->fopts_len); + } + + /* TODO: Parse frame options */ + + /* Parse FPort and decrypt payload */ + if (skb->len > 0) { + if (skb->len <= LRW_FPORT_LEN) + goto lrw_parse_frame_err; + + /* TODO: Deal FPort */ + + skb_pull(skb, LRW_FPORT_LEN); + + lrw_decrypt_buf(lrw_st->apps_skc_tfm, LRW_DOWNLINK, + ss->devaddr, fhdr->fcnt, skb->data, skb->len); + } + + return 0; + +lrw_parse_frame_err: + return -EMSGSIZE; +} + +struct lrw_session * +lrw_rx_skb_2_session(struct lrw_struct *lrw_st, struct sk_buff *rx_skb) +{ + struct lrw_session *ss; + __le16 *p_fcnt; + u16 fcnt; + u16 ofs; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + ofs = LRW_MHDR_LEN + LRW_DEVADDR_LEN + LRW_FCTRL_LEN; + p_fcnt = (__le16 *)(rx_skb->data + ofs); + fcnt = le16_to_cpu(*p_fcnt); + + /* Find the corresponding session */ + ss = lrw_st->_cur_ss; + + /* Frame count downlink check */ + if (fcnt >= (ss->fcnt_down & 0xFFFF)) + ss->rx_skb = rx_skb; + else + ss = NULL; + + return ss; +} + +void +lrw_rx_work(struct work_struct *work) +{ + struct lrw_struct *lrw_st; + struct lrw_session *ss; + struct sk_buff *skb; + + lrw_st = container_of(work, struct lrw_struct, rx_work); + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + skb = skb_dequeue(&lrw_st->rx_skb_list); + + /* Check and parse the RX frame */ + ss = lrw_rx_skb_2_session(lrw_st, skb); + if (!ss) + goto lrw_rx_work_not_new_frame; + + if (lrw_parse_frame(ss, skb)) { + ss->rx_skb = NULL; + goto lrw_rx_work_not_new_frame; + } + + /* Check the TX frame is acked or not */ + if (ss->tx_should_ack) { + ss->rx_skb = NULL; + goto lrw_rx_work_not_new_frame; + } + + /* The TX frame is acked or no need to be acked */ + del_timer(&ss->timer); + lrw_st->rx_should_ack = (ss->rx_fhdr.mtype & 0xC0) == 0x40; + + lrw_st->ndev->stats.rx_packets++; + lrw_st->ndev->stats.rx_bytes += ss->rx_skb->len; + + spin_lock_bh(&ss->state_lock); + ss->state = LRW_RXRECEIVED_SS; + spin_unlock_bh(&ss->state_lock); + + if (ss->rx_skb->len > 0) { + lrw_get_mac_cb(skb)->devaddr = lrw_st->devaddr; + skb->ip_summed = CHECKSUM_UNNECESSARY; + skb->protocol = htons(ETH_P_LORAWAN); + skb->pkt_type = PACKET_HOST; + netif_receive_skb(skb); + } + + ss->rx_skb = NULL; + + mutex_lock(&lrw_st->ss_list_lock); + lrw_st->fcnt_down = ss->rx_fhdr.fcnt; + lrw_st->_cur_ss = NULL; + lrw_del_ss(ss); + lrw_st->state = LRW_STATE_IDLE; + mutex_unlock(&lrw_st->ss_list_lock); + + return; + +lrw_rx_work_not_new_frame: + /* Drop the RX frame if checked failed */ + if (skb) + kfree_skb(skb); +} + +int +lrw_check_mic(struct crypto_shash *tfm, struct sk_buff *skb) +{ + u8 cks[LRW_MIC_LEN]; + u32 devaddr; + size_t len; + u16 fcnt; + u8 *buf; + u8 *mic; + u16 ofs; + + buf = skb->data; + devaddr = le32_to_cpu(*((__le32 *)(buf + LRW_MHDR_LEN))); + ofs = LRW_MHDR_LEN + LRW_DEVADDR_LEN + LRW_FCTRL_LEN; + fcnt = le16_to_cpu(*(__le16 *)(buf + ofs)); + len = skb->len - LRW_MIC_LEN; + mic = skb->data + len; + + lrw_calc_mic(tfm, LRW_DOWNLINK, devaddr, fcnt, buf, len, cks); + + return (!memcmp(cks, mic, LRW_MIC_LEN)); +} + +/** + * lrw_rx_irqsave - Tell LoRaWAN module that there is new received frame + * @hw: the LoRa device + * @skb: the new received frame + */ +void +lrw_rx_irqsave(struct lrw_hw *hw, struct sk_buff *skb) +{ + struct lrw_struct *lrw_st = container_of(hw, struct lrw_struct, hw); + u32 devaddr; + u8 mtype; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + if (skb->len < LRW_MHDR_LEN + LRW_DEVADDR_LEN + LRW_FCTRL_LEN + + LRW_FCNT_LEN + LRW_MIC_LEN) + goto lrw_rx_irqsave_err; + + mtype = skb->data[0] >> 5; + devaddr = le32_to_cpu(*(__le32 *)(skb->data + LRW_MHDR_LEN)); + + /* Check the frame is the downlink frame */ + if ((mtype == LRW_UNCONFIRMED_DATA_DOWN || + mtype == LRW_CONFIRMED_DATA_DOWN) && + devaddr == lrw_st->devaddr && + lrw_check_mic(lrw_st->nwks_shash_tfm, skb)) { + /* Remove message integrity code (MIC) */ + skb_trim(skb, skb->len - LRW_MIC_LEN); + skb_queue_tail(&lrw_st->rx_skb_list, skb); + schedule_work(&lrw_st->rx_work); + return; + } + +lrw_rx_irqsave_err: + kfree_skb(skb); +} +EXPORT_SYMBOL(lrw_rx_irqsave); + +static void +lrw_rexmit(struct timer_list *timer) +{ + struct lrw_session *ss = container_of(timer, struct lrw_session, timer); + struct lrw_struct *lrw_st = ss->lrw_st; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + lrw_st->state = LRW_STATE_TX; + lrw_xmit((unsigned long)lrw_st); +} + +static void +rx_timeout_work(struct work_struct *work) +{ + struct lrw_struct *lrw_st; + struct lrw_session *ss; + + ss = container_of(work, struct lrw_session, timeout_work); + lrw_st = ss->lrw_st; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + mutex_lock(&lrw_st->ss_list_lock); + lrw_st->_cur_ss = NULL; + lrw_st->state = LRW_STATE_IDLE; + lrw_del_ss(ss); + mutex_unlock(&lrw_st->ss_list_lock); +} + +static void +rx2_timeout_isr(struct timer_list *timer) +{ + struct lrw_session *ss = container_of(timer, struct lrw_session, timer); + struct lrw_struct *lrw_st = ss->lrw_st; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + /* Check TX is acked or not */ + if (!ss->tx_should_ack) { + spin_lock_bh(&ss->state_lock); + if (ss->state != LRW_RXRECEIVED_SS) + ss->state = LRW_RXTIMEOUT_SS; + spin_unlock_bh(&ss->state_lock); + + if (ss->state == LRW_RXTIMEOUT_SS) { + netdev_dbg(lrw_st->ndev, "%s: rx time out\n", __func__); + goto rx2_timeout_isr_no_retry_rx_frame; + } else { + return; + } + } + + /* Check the session need to be retransmitted or not */ + if (ss->retry > 0) { + ss->state = LRW_RETRANSMIT_SS; + ss->retry--; + + /* Start timer for ack timeout and retransmit */ + ss->timer.function = lrw_rexmit; + ss->timer.expires = jiffies_64 + ss->ack_timeout * HZ; + add_timer(&ss->timer); + } else { + /* Retry failed */ +rx2_timeout_isr_no_retry_rx_frame: + schedule_work(&ss->timeout_work); + } +} + +static void +rx2_delay_isr(struct timer_list *timer) +{ + struct lrw_session *ss = container_of(timer, struct lrw_session, timer); + struct lrw_struct *lrw_st = ss->lrw_st; + unsigned long delay; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + /* Start timer for RX2 window */ + ss->timer.function = rx2_timeout_isr; + delay = jiffies_64 + (ss->rx2_window + 20) * HZ / 1000 + HZ; + ss->timer.expires = delay; + add_timer(&ss->timer); + + /* Start LoRa hardware to RX2 window */ + ss->state = LRW_RX2_SS; + lrw_st->ops->start_rx_window(&lrw_st->hw, ss->rx2_window + 20); +} + +static void +rx1_delay_isr(struct timer_list *timer) +{ + struct lrw_session *ss = container_of(timer, struct lrw_session, timer); + struct lrw_struct *lrw_st = ss->lrw_st; + unsigned long delay; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + /* Start timer for RX_Delay2 - RX_Delay2 */ + ss->timer.function = rx2_delay_isr; + delay = jiffies_64 + (ss->rx_delay2 - ss->rx_delay1) * HZ; + ss->timer.expires = delay; + add_timer(&ss->timer); + + /* Start LoRa hardware to RX1 window */ + ss->state = LRW_RX1_SS; + lrw_st->ops->start_rx_window(&lrw_st->hw, ss->rx1_window + 20); +} + +void +lrw_sent_tx_work(struct lrw_struct *lrw_st, struct sk_buff *skb) +{ + struct lrw_session *ss = lrw_st->_cur_ss; + struct net_device *ndev; + unsigned long delay; + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + ss->state = LRW_XMITTED; + + /* Start session timer for RX_Delay1 */ + timer_setup(&ss->timer, rx1_delay_isr, 0); + delay = jiffies_64 + ss->rx_delay1 * HZ - 20 * HZ / 1000; + ss->timer.expires = delay; + add_timer(&ss->timer); + + ndev = skb->dev; + ndev->stats.tx_packets++; + ndev->stats.tx_bytes += skb->len; + dev_consume_skb_any(skb); + ss->tx_skb = NULL; +} + +/** + * lrw_xmit_complete - Tell LoRaWAN module that the frame is xmitted completely + * @hw: the LoRa device + * @skb: the xmitted frame + */ +void +lrw_xmit_complete(struct lrw_hw *hw, struct sk_buff *skb) +{ + struct lrw_struct *lrw_st = container_of(hw, struct lrw_struct, hw); + + netdev_dbg(lrw_st->ndev, "%s\n", __func__); + + lrw_sent_tx_work(lrw_st, skb); + lrw_st->state = LRW_STATE_RX; +} +EXPORT_SYMBOL(lrw_xmit_complete); diff --git a/net/maclorawan/main.c b/net/maclorawan/main.c new file mode 100644 index 000000000000..caecfb3f66c6 --- /dev/null +++ b/net/maclorawan/main.c @@ -0,0 +1,606 @@ +// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause +/*- + * LoRaWAN soft MAC + * + * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw> + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/list.h> + +#include <linux/lora/lorawan.h> +#include <linux/lora/lorawan_netdev.h> +#include "maclorawan.h" + +#define PHY_NAME "lora" + +/* Need to find a way to define or assign */ +#define LORAWAN_MTU 20 + +static struct class *lrw_sys_class; + +static void +lrw_if_setup(struct net_device *ndev) +{ + ndev->addr_len = LRW_DEVADDR_LEN; + memset(ndev->broadcast, 0xFF, ndev->addr_len); + ndev->type = ARPHRD_LORAWAN; + + ndev->hard_header_len = LRW_MHDR_LEN + LRW_FHDR_MAX_LEN + LRW_FPORT_LEN; + ndev->needed_tailroom = LRW_MIC_LEN; + + /** + * TODO: M should be a dynamic value defined by Regional Parameters, + * Being fixed for now. Going to be changed. + */ + ndev->mtu = LORAWAN_MTU; +} + +/** + * lrw_alloc_hw - Allocate a memory space for the LoRa device + * @priv_data_len: the private data size + * @lrw_operations: the implemented operations of the LoRa device + * + * Return: address of the LoRa device or NULL for failed + */ +struct lrw_hw * +lrw_alloc_hw(size_t priv_data_len, struct lrw_operations *ops) +{ + struct lrw_struct *lrw_st; + struct net_device *ndev; + int ret; + + if (WARN_ON(!ops || !ops->start || !ops->stop || !ops->xmit_async || + !ops->set_txpower || !ops->set_dr || + !ops->start_rx_window || !ops->set_state)) + return NULL; + + /* In memory it'll be like this: + * + * +-----------------------+ + * | struct net_device | + * +-----------------------+ + * | struct lrw_struct | + * +-----------------------+ + * | driver's private data | + * +-----------------------+ + */ + ndev = alloc_netdev(sizeof(struct lrw_struct) + priv_data_len, + PHY_NAME "%d", NET_NAME_ENUM, lrw_if_setup); + if (!ndev) + return ERR_PTR(-ENOMEM); + ret = dev_alloc_name(ndev, ndev->name); + if (ret < 0) + goto lrw_alloc_hw_err; + + lrw_st = (struct lrw_struct *)netdev_priv(ndev); + lrw_st->ndev = ndev; + + lrw_st->state = LRW_STOP; + lrw_st->ops = ops; + lrw_st->hw.priv = (u8 *)lrw_st + sizeof(struct lrw_struct); + skb_queue_head_init(&lrw_st->rx_skb_list); + + ndev->flags |= IFF_NOARP; + ndev->features |= NETIF_F_HW_CSUM; + + return &lrw_st->hw; + +lrw_alloc_hw_err: + free_netdev(ndev); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(lrw_alloc_hw); + +/** + * lrw_free_hw - Free the LoRa device's memory resource + * @hw: the LoRa device going to be freed + */ +void +lrw_free_hw(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + free_netdev(lrw_st->ndev); +} +EXPORT_SYMBOL(lrw_free_hw); + +/** + * lrw_set_deveui - Set the LoRa device's DevEUI + * @hw: the LoRa device going to be set + * @eui: the global end-device ID in IEEE EUI64 address space + */ +void +lrw_set_deveui(struct lrw_hw *hw, u64 eui) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + lrw_st->dev_eui = eui; +} +EXPORT_SYMBOL(lrw_set_deveui); + +/** + * lrw_get_deveui - Get the LoRa device's DevEUI + * @hw: the LoRa device going to be got from + * + * Return: the device's DevEUI in IEEE EUI64 address space + */ +u64 +lrw_get_deveui(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + return lrw_st->dev_eui; +} +EXPORT_SYMBOL(lrw_get_deveui); + +/** + * lrw_set_appeui - Set the LoRa device's AppEUI + * @hw: the LoRa device going to be set + * @eui: the global end-device ID in IEEE EUI64 address space + */ +void +lrw_set_appeui(struct lrw_hw *hw, u64 eui) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + lrw_st->app_eui = eui; +} +EXPORT_SYMBOL(lrw_set_appeui); + +/** + * lrw_get_appeui - Get the LoRa device's AppEUI + * @hw: the LoRa device going to be got from + * + * Return: the device's AppEUI in IEEE EUI64 address space + */ +u64 +lrw_get_appeui(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + return lrw_st->app_eui; +} +EXPORT_SYMBOL(lrw_get_appeui); + +/** + * lrw_set_devaddr - Set the LoRa device's address + * @hw: the LoRa device going to be set + * @devaddr: the device address + */ +void +lrw_set_devaddr(struct lrw_hw *hw, u32 devaddr) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + lrw_st->devaddr = devaddr; +} +EXPORT_SYMBOL(lrw_set_devaddr); + +/** + * lrw_get_devaddr - Get the LoRa device's address + * @hw: the LoRa device going to be got from + * + * Return: the device address + */ +u32 +lrw_get_devaddr(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st; + + lrw_st = container_of(hw, struct lrw_struct, hw); + return lrw_st->devaddr; +} +EXPORT_SYMBOL(lrw_get_devaddr); + +/** + * lrw_add_hw - Add a LoRaWAN hardware as a network device + * @lrw_st: the LoRa device going to be added + * + * Return: 0 / other number for success / failed + */ +static int +lrw_add_hw(struct lrw_struct *lrw_st) +{ + struct net_device *ndev = lrw_st->ndev; + __be32 be_addr; + int ret; + + lrw_st->fcnt_up = 0; + lrw_st->fcnt_down = 0; + lrw_st->_cur_ss = NULL; + + mutex_init(&lrw_st->ss_list_lock); + INIT_LIST_HEAD(&lrw_st->ss_list); + + tasklet_init(&lrw_st->xmit_task, lrw_xmit, (unsigned long)lrw_st); + INIT_WORK(&lrw_st->rx_work, lrw_rx_work); + + be_addr = cpu_to_be32(lrw_st->devaddr); + memcpy(ndev->perm_addr, &be_addr, ndev->addr_len); + memcpy(ndev->dev_addr, ndev->perm_addr, ndev->addr_len); + + write_pnet(&lrw_st->_net, &init_net); + ret = register_netdev(ndev); + + return ret; +} + +/** + * lrw_remove_hw - Remove a LoRaWAN hardware from a network device + * @lrw_st: the LoRa device going to be removed + */ +static void +lrw_remove_hw(struct lrw_struct *lrw_st) +{ + unregister_netdev(lrw_st->ndev); + tasklet_kill(&lrw_st->xmit_task); +} + +bool +ready2write(struct lrw_struct *lrw_st) +{ + bool status = false; + + if (!lrw_st->_cur_ss && lrw_st->state == LRW_STATE_IDLE) + status = true; + + return status; +} + +bool +ready2read(struct lrw_struct *lrw_st) +{ + struct lrw_session *ss; + bool status = false; + + if (!list_empty(&lrw_st->ss_list) && lrw_st->state != LRW_STOP) { + ss = list_first_entry(&lrw_st->ss_list, + struct lrw_session, + entry); + if (ss->state == LRW_RXRECEIVED_SS) + status = true; + } + + return status; +} + +static int +lrw_if_up(struct net_device *ndev) +{ + struct lrw_struct *lrw_st = NETDEV_2_LRW(ndev); + int ret = -EBUSY; + + if (lrw_st->state == LRW_STOP) { + ret = lrw_start_hw(lrw_st); + netif_start_queue(ndev); + } + + return ret; +} + +static int +lrw_if_down(struct net_device *ndev) +{ + struct lrw_struct *lrw_st = NETDEV_2_LRW(ndev); + + if (lrw_st->state != LRW_STOP) { + netif_stop_queue(ndev); + lrw_stop_hw(lrw_st); + } + + return 0; +} + +static netdev_tx_t +lrw_if_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct lrw_struct *lrw_st = NETDEV_2_LRW(ndev); + struct lrw_session *ss; + netdev_tx_t ret; + + ret = NETDEV_TX_OK; + + ss = lrw_alloc_ss(lrw_st); + if (!ss) + return NETDEV_TX_BUSY; + + mutex_lock(&lrw_st->ss_list_lock); + if (ready2write(lrw_st)) { + list_add_tail(&ss->entry, &lrw_st->ss_list); + lrw_st->state = LRW_STATE_TX; + lrw_st->_cur_ss = ss; + ss->fcnt_up = lrw_st->fcnt_up; + ss->fcnt_down = lrw_st->fcnt_down; + /* TODO: RX delay #1/#2 should be set by regional parameters */ + ss->rx_delay1 = 1; + ss->rx_delay2 = 2; + ss->rx1_window = 500; + ss->rx2_window = 500; + } else { + ret = NETDEV_TX_BUSY; + } + mutex_unlock(&lrw_st->ss_list_lock); + + if (ret == NETDEV_TX_OK) { + ss->state = LRW_INIT_SS; + ss->tx_skb = skb; + lrw_prepare_tx_frame(ss); + tasklet_schedule(&lrw_st->xmit_task); + } else { + lrw_free_ss(ss); + } + + return ret; +} + +static int +lrw_if_get_addr(struct lrw_struct *lrw_st, struct sockaddr_lorawan *addr) +{ + int ret = 0; + + switch (addr->addr_in.addr_type) { + case LRW_ADDR_DEVADDR: + addr->addr_in.devaddr = lrw_st->devaddr; + break; + case LRW_ADDR_DEVEUI: + addr->addr_in.dev_eui = lrw_st->dev_eui; + break; + case LRW_ADDR_APPEUI: + addr->addr_in.app_eui = lrw_st->app_eui; + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} + +static int +lrw_if_set_addr(struct lrw_struct *lrw_st, struct sockaddr_lorawan *addr) +{ + struct lrw_hw *hw = &lrw_st->hw; + int ret = 0; + + if (netif_running(lrw_st->ndev)) + return -EBUSY; + + switch (addr->addr_in.addr_type) { + case LRW_ADDR_DEVADDR: + lrw_set_devaddr(hw, addr->addr_in.devaddr); + break; + case LRW_ADDR_DEVEUI: + lrw_set_deveui(hw, addr->addr_in.dev_eui); + break; + case LRW_ADDR_APPEUI: + lrw_set_appeui(hw, addr->addr_in.app_eui); + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} + +static void +swap_bytes(u8 *dst, u8 *src, size_t l) +{ + /* Human reading is big-endian, but LoRaWAN is little-endian */ + unsigned int i; + + for (i = 0; i < l; i++) + dst[i] = src[l - i - 1]; +} + +int +lrw_set_key(struct lrw_hw *hw, u8 type, u8 *key, size_t key_len) +{ + struct lrw_struct *lrw_st; + int ret = 0; + + lrw_st = container_of(hw, struct lrw_struct, hw); + + netdev_dbg(lrw_st->ndev, "%s: type=%d\n", __func__, type); + if (lrw_st->state != LRW_STOP) + return -EINVAL; + + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, + 16, 1, key, key_len, true); + switch (type) { + case LRW_APPKEY: + swap_bytes(lrw_st->appkey, key, key_len); + break; + case LRW_NWKSKEY: + swap_bytes(lrw_st->nwkskey, key, key_len); + break; + case LRW_APPSKEY: + swap_bytes(lrw_st->appskey, key, key_len); + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} +EXPORT_SYMBOL(lrw_set_key); + +int +lrw_get_key(struct lrw_hw *hw, u8 type, u8 *key, size_t key_len) +{ + struct lrw_struct *lrw_st; + int ret = 0; + + lrw_st = container_of(hw, struct lrw_struct, hw); + + netdev_dbg(lrw_st->ndev, "%s: type=%d\n", __func__, type); + switch (type) { + case LRW_APPKEY: + swap_bytes(key, lrw_st->appkey, key_len); + break; + case LRW_NWKSKEY: + swap_bytes(key, lrw_st->nwkskey, key_len); + break; + case LRW_APPSKEY: + swap_bytes(key, lrw_st->appskey, key_len); + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} + +static int +lrw_if_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd) +{ + struct lrw_struct *lrw_st = NETDEV_2_LRW(ndev); + struct sockaddr_lorawan *addr; + int ret = 0; + + netdev_dbg(ndev, "%s: ioctl file (cmd=0x%X)\n", __func__, cmd); + + /* I/O control by each command */ + switch (cmd) { + /* Set & get the DevAddr, DevEUI and AppEUI */ + case SIOCSIFADDR: + addr = (struct sockaddr_lorawan *)&ifr->ifr_addr; + ret = lrw_if_set_addr(lrw_st, addr); + break; + case SIOCGIFADDR: + addr = (struct sockaddr_lorawan *)&ifr->ifr_addr; + ret = lrw_if_get_addr(lrw_st, addr); + break; + default: + ret = -ENOTSUPP; + } + + return ret; +} + +static int +lrw_if_set_mac(struct net_device *ndev, void *p) +{ + struct lrw_struct *lrw_st = NETDEV_2_LRW(ndev); + struct sockaddr *addr = p; + __be32 *be_addr; + + be_addr = (__be32 *)addr->sa_data; + + netdev_dbg(ndev, "%s: AF_TYPE:%d set mac address %X\n", + __func__, addr->sa_family, be32_to_cpu(*be_addr)); + + if (netif_running(ndev)) + return -EBUSY; + + lrw_set_devaddr(&lrw_st->hw, be32_to_cpu(*be_addr)); + memcpy(ndev->dev_addr, be_addr, ndev->addr_len); + + return 0; +} + +static const struct net_device_ops lrw_if_ops = { + .ndo_open = lrw_if_up, + .ndo_stop = lrw_if_down, + .ndo_start_xmit = lrw_if_start_xmit, + .ndo_do_ioctl = lrw_if_ioctl, + .ndo_set_mac_address = lrw_if_set_mac, +}; + +/** + * lrw_register_hw - Register as a LoRaWAN compatible device + * @hw: LoRa device going to be registered + * + * Return: 0 / negative number for success / error number + */ +int +lrw_register_hw(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st = container_of(hw, struct lrw_struct, hw); + int ret; + + device_initialize(&lrw_st->dev); + dev_set_name(&lrw_st->dev, netdev_name(lrw_st->ndev)); + lrw_st->dev.class = lrw_sys_class; + lrw_st->dev.platform_data = lrw_st; + + ret = device_add(&lrw_st->dev); + if (ret) + goto lrw_register_hw_end; + + /* Add a LoRa device node as a network device */ + lrw_st->ndev->netdev_ops = &lrw_if_ops; + ret = lrw_add_hw(lrw_st); + if (!ret) + netdev_info(lrw_st->ndev, "register\n"); + +lrw_register_hw_end: + return ret; +} +EXPORT_SYMBOL(lrw_register_hw); + +/** + * lrw_unregister_hw - Unregister the LoRaWAN compatible device + * @hw: LoRa device going to be unregistered + */ +void +lrw_unregister_hw(struct lrw_hw *hw) +{ + struct lrw_struct *lrw_st = container_of(hw, struct lrw_struct, hw); + + netdev_info(lrw_st->ndev, "unregister\n"); + + /* Stop and remove the LoRaWAM hardware from system */ + if (lrw_st->state != LRW_STOP) + lrw_stop_hw(lrw_st); + device_del(&lrw_st->dev); + lrw_remove_hw(lrw_st); +} +EXPORT_SYMBOL(lrw_unregister_hw); + +static int __init +lrw_init(void) +{ + int err = 0; + + pr_info("%s: module inserted\n", LORAWAN_MODULE_NAME); + + /* Create device class */ + lrw_sys_class = class_create(THIS_MODULE, LORAWAN_MODULE_NAME); + if (IS_ERR(lrw_sys_class)) { + pr_err("%s: Failed to create a class of LoRaWAN\n", + LORAWAN_MODULE_NAME); + err = PTR_ERR(lrw_sys_class); + goto lrw_init_end; + } + + pr_debug("%s: class created\n", LORAWAN_MODULE_NAME); + +lrw_init_end: + return err; +} + +static void __exit +lrw_exit(void) +{ + /* Delete device class */ + class_destroy(lrw_sys_class); + pr_info("%s: module removed\n", LORAWAN_MODULE_NAME); +} + +module_init(lrw_init); +module_exit(lrw_exit); + +MODULE_AUTHOR("Jian-Hong Pan, <starnight@g.ncu.edu.tw>"); +MODULE_DESCRIPTION("LoRaWAN soft MAC kernel module"); +MODULE_LICENSE("Dual BSD/GPL");

[v5,5/6] net: maclorawan: Implement maclorawan class module

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